更多“Oxford Advanced Learner’s Dict”相关的问题
喉的解剖结构描述不恰当的是（）
A . 解剖上分为三个区域：声门上区、声门区、声门下区
B . 包括两个间隙：茎突前间隙和声门旁间隙
C . 位于颈前中央，成人相当于第4～6颈椎椎体水平
D . 主要由骨骼、黏膜和肌肉组成
E . 其上方与口咽相延续，下方与气管相通
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The Development of American Postal System In the early days of the United States, postal charges were paid by the recipient and charges varied with the distance carried. In 1825, the United States Congress permitted local postmasters to give letters to mail carriers for home delivery, but these carriers received no government salary and their entire compensation depended on what they were paid by the recipients of individual letters. In 1847, the United States Post Office Department adopted the idea of a postage stamp, which of course simplified the payment for postal service but caused grumbling by those who did not like to prepay. Besides, the stamp covered only delivery to the post office and did not include carrying it to a private address. In Philadelphia, for example, with a population of 150,000, people still had to go to the post office to get their mail. The confusion and congestion of individual citizens looking for their letters was itself enough to discourage use of the mail. It is no wonder that, during the years of these cumbersome arrangements, private letter-carrying and express businesses developed. Although their activities were only semi legal, they thrived and actually advertised that between Boston and Philadelphia they were half-day speedier than the government mail. The government postal service lost volume to private competition and was not able to handle efficiently even the business it had. Finally, in 1863, Congress provided that the mail carriers who delivered the mail from the post offices to private addresses should receive a government salary, and that there should be no extra charge for that delivery. But this delivery service was at first confined to cities, and free home delivery became a sign of urbanization. In 1890, of the 75 million people in the United States, fewer than 20 million had mail delivered free to their doors. The rest, nearly three quarters of the population, still received no mail unless they went to their post office.
A．The development of a government postal system.B．The increasing use of private mail services.C．The history of postal stamps.D．The comparison of urban and rural postal services.
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平面任意力系的平衡方程可以求解3个未知数，汇交力系的平衡方程可以求解2个未知数。
板料在连续模中定位最好的方法是定位。
A . A．导料板
B . B．导正销
C . C．侧刃
D . D．导柱、导套
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铺轨之前应按中线预铺道碴。双层道床按底碴厚度铺足，单层道床铺设厚度以（）cm为宜，并将顶面整平，中间拉槽，中间凹槽宽宜为60cm。
A.10～15
B.15～20
C.20～25
D.25～30
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铅增感屏有增感作用，但是也会增加散射线影响底片的清晰度
A . 正确
B . 错误
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在不同个体之间进行心功能比较时宜选用的评定指标是
A．搏出量
B．心输出量
C．射血分数
D．静息心指数
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患儿6个月，急性心力衰竭，现用强心药物洋地黄类治疗，当出现下列哪种情况时应及时停用洋地黄类药物（ ）。
A . 尿量增多B . 心动过缓C . 肝脏回缩D . 水肿消退E . 呼吸减慢
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采用TIG的方法焊接小直径管，当其它工艺参数不变，焊接电流增加时，焊缝宽度和余高稍有增加，但熔深减少。
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The police _____ the lost boy everywhere when he suddenly turned up in a supermarket.
A . searchedB . searched forC . was searchingD . were searching for
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政府对经济运行进行宏观调控有直接调控和间接调控两种方式，直接调控实质上是一种( )调控方式。
A.限制微观经济主体的自主性和市场机制自发作用
B.承认微观经济主体自主经营和市场机制作用
C.运用经济手段和市场参数调节经济运行
D.运用行政手段对经济运行进行参数调节
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TSR系统通过TSR-CTC设备与CTC中心设备通信，由于CTC设备放置于调度中心，因此双方需要通过外部架设的（）进行通信。
A.信号安全数据网
B.2M通道
C.集中监测通道
D.125MLAN通道
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节点焊缝中线状缺陷反射波的特征是（）
A.从各方面探测波幅基本不变，但由于缺陷取向关系反射波幅有时变化很大
B.反射波幅较高
C.左右移动探头，缺陷有一定指示长度
D.以上各点
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